class  类人猿 {
     	void crySpeak(String s) {
       		System.out.println(s); 
   	}  
}
class People extends 类人猿 {
      	void computer(int a,int b) { 
		int c=a*b;
	  	System.out.println(c); 
	}
   	void crySpeak(String s) {
     		System.out.println("***"+s+"***"); 
  	}  
}
public class Example5_10 {
	   public static void main(String args[]) {
	    	   类人猿 monkey;
	     	   People geng = new People();   
		   monkey = geng ; //monkey是People对象geng的上转型对象
	 	   monkey.crySpeak("I love this game");//等同于geng.crySpeak("I love this game");
	    	   People people=(People)monkey; //把上转型对象强制转化为子类的对象
	     	   people.computer(10,10);
  	   }
}
